1) Buffer overflow

Risk: High

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-1844

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing web content in WebKit. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apple iOS: 14.0 18A373, 14.1 18A8395, 14.2 18B92, 14.3 18C66, 14.4 18D52

iPadOS: 14.0 18A373, 14.1 18A8395, 14.2 18B92, 14.3 18C66, 14.4 18D52

CPE

• cpe:2.3:o:apple:apple_ios:14.2:18B92:*:*:*::*:*
• cpe:2.3:o:apple:apple_ios:14.1:18A8395:*:*:*::*:*
• cpe:2.3:o:apple:apple_ios:14.0:18A373:*:*:*::*:*
• cpe:2.3:o:apple:ipados:14.4:18D52:*:*:*::*:*
• cpe:2.3:o:apple:apple_ios:14.4:18D52:*:*:*::*:*
• cpe:2.3:o:apple:ipados:14.3:18C66:*:*:*::*:*
• cpe:2.3:o:apple:apple_ios:14.3:18C66:*:*:*::*:*
• cpe:2.3:o:apple:ipados:14.2:18B92:*:*:*::*:*
• cpe:2.3:o:apple:ipados:14.1:18A8395:*:*:*::*:*
• cpe:2.3:o:apple:ipados:14.0:18A373:*:*:*::*:*

External links

https://support.apple.com/en-us/HT212221

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.